Delete or redirect the content is not always the best solution to optimize your seo. If you have blog posts properly optimized, you will be able to update it to improve their page ranking on Google.
Update your content will give him a "good account" of the part of Google. It also presents many advantages, because you do not need, for example :
- Create a new content : less work and labour.
- Produce exchanges of links (link building) : The content already contains backlinks.
You can also update your title, meta description or the part quote of your code. Using this method, you can optimize the relevance of some specific keywords and optimize your click-through rate.